When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of October 2025.

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$473 Cheap Flights from St. Louis to Sofia in 2025/26

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Find the cheapest flights from St. Louis to Sofia

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Cheap round-trip flights

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5:24 pm - 6:20 pmSTL-SOF

16h 56m2 stops

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$532United Airlines

Find Deal

Wed, Nov 26 - Wed, Dec 3

8:25 am - 1:00 pmSTL-SOF

20h 35m2 stops

6:10 am - 3:29 pmSOF-STL

41h 19m2 stops

$538United Airlines

Find Deal

Sun, Nov 9 - Sun, Nov 23

3:50 pm - 6:00 pmSTL-SOF

18h 10m1 stop

6:10 am - 1:55 pmSOF-STL

15h 45m1 stop

$541Multiple Airlines

Find Deal

Sun, Nov 9 - Sun, Nov 23

4:05 pm - 10:45 pmSTL-SOF

23h 40m2 stops

1:50 pm - 3:24 pmSOF-STL

33h 34m2 stops

$642United Airlines

Find Deal

Fri, Mar 27 - Tue, Mar 31

4:05 pm - 10:45 pmSTL-SOF

23h 40m2 stops

6:15 am - 2:18 pmSOF-STL

16h 03m2 stops

$645United Airlines

Find Deal

Fri, Mar 27 - Tue, Mar 31

4:50 pm - 1:35 pmSTL-SOF

13h 45m1 stop

6:40 pm - 1:30 pmSOF-STL

26h 50m1 stop

$662Lufthansa

Find Deal

Fri, Mar 27 - Tue, Mar 31

6:42 pm - 10:45 pmSTL-SOF

20h 03m2 stops

6:00 am - 11:59 pmSOF-STL

25h 59m2 stops

$868Lufthansa

Find Deal

Fri, Dec 12 - Thu, Jan 8

3:50 pm - 1:35 pmSTL-SOF

13h 45m1 stop

2:00 pm - 3:29 pmSOF-STL

57h 29m2 stops

$908Multiple Airlines

Find Deal

Fri, Dec 12 - Thu, Jan 8

4:05 pm - 6:00 pmSTL-SOF

17h 55m2 stops

6:10 am - 9:40 pmSOF-STL

23h 30m3 stops

$1,004Air Canada

Find Deal

Sun, Nov 9 - Sun, Nov 23

10:00 am - 1:35 pmSTL-SOF

19h 35m3 stops

6:00 am - 9:13 pmSOF-STL

23h 13m3 stops

$1,762Air Canada

Find Deal

Fri, Dec 12 - Thu, Jan 8

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets

United Airlines

Nov 26

STL5:24 pmLambert-St Louis

16h 56m

2 stops

SOF6:20 pmSofia

Dec 3

SOF6:10 amSofia

15h 45m

1 stop

STL1:55 pmLambert-St Louis

$532

Find similar

United Airlines

Nov 9

STL8:25 amLambert-St Louis

20h 35m

2 stops

SOF1:00 pmSofia

Nov 23

SOF6:10 amSofia

41h 19m

2 stops

STL3:29 pmLambert-St Louis

$538

Find similar

United Airlines

Mar 27

STL4:05 pmLambert-St Louis

23h 40m

2 stops

SOF10:45 pmSofia

Mar 31

SOF1:50 pmSofia

33h 34m

2 stops

STL3:24 pmLambert-St Louis

$642

Find similar

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

Lufthansa

Mar 27

STL4:50 pmLambert-St Louis

13h 45m

1 stop

SOF1:35 pmSofia

Mar 31

SOF6:40 pmSofia

26h 50m

1 stop

STL1:30 pmLambert-St Louis

$662

Find similar

Lufthansa

Dec 12

STL6:42 pmLambert-St Louis

20h 03m

2 stops

SOF10:45 pmSofia

Jan 8

SOF6:00 amSofia

25h 59m

2 stops

STL11:59 pmLambert-St Louis

$868

Find similar

Lufthansa

Dec 12

STL6:42 pmLambert-St Louis

20h 03m

2 stops

SOF10:45 pmSofia

Jan 9

SOF6:10 amSofia

24h 48m

2 stops

STL10:58 pmLambert-St Louis

$918

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 11/26

5:24 pm-6:20 pm

2 stops16h 56m

Sofia

Wed 12/3

6:10 am-1:55 pm

1 stop15h 45m

$532

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/9

8:25 am-1:00 pm

2 stops20h 35m

Sofia

Sun 11/23

6:10 am-3:29 pm

2 stops41h 19m

$538

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/9

3:50 pm-6:00 pm

1 stop18h 10m

Sofia

Sun 11/23

6:10 am-1:55 pm

1 stop15h 45m

$541

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:05 pm-10:45 pm

2 stops23h 40m

Sofia

Tue 3/31

1:50 pm-3:24 pm

2 stops33h 34m

$642

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:05 pm-10:45 pm

2 stops23h 40m

Sofia

Tue 3/31

6:15 am-2:18 pm

2 stops16h 03m

$645

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 3/27

4:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 3/31

6:40 pm-1:30 pm

1 stop26h 50m

$662

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 12/12

6:42 pm-10:45 pm

2 stops20h 03m

Sofia

Thu 1/8

6:00 am-11:59 pm

2 stops25h 59m

$868

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 12/12

3:50 pm-1:35 pm

1 stop13h 45m

Sofia

Thu 1/8

2:00 pm-3:29 pm

2 stops57h 29m

$908

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/9

4:05 pm-6:00 pm

2 stops17h 55m

Sofia

Sun 11/23

6:10 am-9:40 pm

3 stops23h 30m

$1,004

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 12/12

10:00 am-1:35 pm

3 stops19h 35m

Sofia

Thu 1/8

6:00 am-9:13 pm

3 stops23h 13m

$1,762

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Sofia?

According to our data, Saturday is the cheapest day to fly to Sofia from St. Louis. The lowest ticket price found for a Saturday departure recently was $1,095. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from St. Louis to Sofia on a Friday will generally be more expensive and average around $1,306. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the morning is the cheapest time of day to fly from St. Louis to Sofia when you can find flight prices for as low as $1,199. Flying to Sofia in the morning is an ideal time because this is during off-peak travel hours. In the afternoon is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,335 per ticket.

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $951 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $799 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 6% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights	None

There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.

Search flight deals

How far is Lambert-St Louis to Sofia by plane?
A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 13h 45m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?
Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?
The number of operators available for flights from Lambert-St Louis Airport to Sofia Airport is 2 as of October 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Sofia?
Based on momondo bookings for flights between St. Louis and Sofia, the leading airline is Lufthansa, making up 78% of the total bookings. Other popular airlines include United Airlines with 22%.

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $669	Free Cancellation	Rating 6.8 7,480 reviews		Search Lufthansa flights
United Airlines	PriceFrom $711	Free Cancellation	Rating 7.4 8,974 reviews		Search United Airlines flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cheap flights from St. Louis to Sofia from $532

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 11/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

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Filter for what you want

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United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight to Sofia?

How far in advance should I book a flight to Sofia?

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 6% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Direct flights

How far is Lambert-St Louis to Sofia by plane?

When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

What documentation or ID do you need to fly to Sofia Airport?

What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

How can momondo help me find flights from St. Louis to Sofia?

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo